|Since you have a problem of space now, this does not make sense. by installing additional OS on additional partitions, you will be using up additional space, not making additional space from nothing. If you need more storage space, install a second hard drive and move all of your files over to the new larger hard drive. If you really have a need for additional operating systems, you then can partition from original hard drive (from the freed up space) or take a part of the new larger hard drive for the other installations.|
As with all partitioning, back up your data to a separate medium before proceeding. And you should know that each installation of a Microsoft Operating system will require an additional license (not so with Linux).